description TOI-700 b Overview
TOI-700 b is a transiting, approximately Earth-sized exoplanet discovered by NASA's TESS mission in the TOI-700 system. It orbits an M dwarf every about 10 days and is the innermost of the system's currently known planets. Its short orbital distance gives it more stellar irradiation than the farther-out TOI-700 d, which receives roughly Earth-like insolation.
help TOI-700 b FAQ
How was TOI-700 b discovered?
NASA's Transiting Exoplanet Survey Satellite, or TESS, found TOI-700 b when it repeatedly crossed the face of its M dwarf star. The planet's discovery was announced in 2020. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI%20700)
How long is a year on TOI-700 b?
TOI-700 b completes one orbit in about 9.98 days at a distance of roughly 0.068 astronomical units. It is the innermost known planet in the TOI-700 system. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI%20700)
How large is TOI-700 b compared with Earth?
Its measured radius is about 0.91 Earth radii, making it approximately Earth-sized. The planet receives roughly five times Earth's stellar irradiation because it orbits so close to its star. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI%20700)
What other planets orbit TOI-700?
The system also includes TOI-700 c, d, and e, with cataloged periods of about 16.05, 37.42, and 27.81 days respectively. Planet d is farther from the star and was the system member that drew particular attention in habitable-zone studies. [NASA Exoplanet Archive](https://exoplanetarchive.ipac.caltech.edu/overview/TOI%20700)
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